SRH velocity questions. Slow gun, chrono,?????
#145858
06/02/2014 3:56 PM
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Joined: Jan 2004
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Vance in AK.
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Pooh-Bah
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OK, I don't live by the chrono, but this bothers me. I come NOWHERE near the velocities listed in Hodgons handbook for their loads in my 7.5" SRH. I realize their 7.5"barrel may be a pressure barrel, but still... These records are from a few years ago, & all my readings are avgs from at least 6rds. Here are a couple of loads I have the data handy for. For 20.0 gr of H-110 with a 405 CP cast they show 1213fps. I was getting 988fps. With 19.0 gr Lil'gun with the 405 CP they show 1219fps, & 21.0 1337fps. With 20.0 I recorded 1151. I was using 400gr cast from a Lee mold but as I recall velocity was about the same from Performance Cast bullets. (By the way, I have tried different primers in both loads & those were the fastest primers. WWLP).
Sooooo..... Those are some pretty HUGE differences, especially on the H-110. Slow gun, whacky chrono, or lying book? Never checked factory ammo. Only tried one chrono to try (old Shooting Chrony). It died & currently no chrono & no one to borrow from. I know, work up an accurate load & go kill stuff. Would still love some input.
Vance in AK.
Matthew 6:33 "But seek first the kingdom of God and His righteousness, and all these things shall be added to you."
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Re: SRH velocity questions. Slow gun, chrono,?????
[Re: Vance in AK.]
#145859
06/02/2014 4:15 PM
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Joined: Jan 2004
Posts: 9,608
s4s4u
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I've always found their numbers a bit "optimistic" and have never been able to reach them with my loads.
Rod, too.
Short cuts often lead to long recoveries.
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Re: SRH velocity questions. Slow gun, chrono,?????
[Re: s4s4u]
#145865
06/02/2014 5:35 PM
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Joined: Sep 2013
Posts: 4,669
Chance Weldon
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That's been the opposite of what I've seen. Most of my handloads post velocities of 100 to 200 fps faster than what the manuals list. Did you apply a heavy crimp to the bullets? That can affect velocity, although usually not by that much.
Formerly TN Lone Wolf
"We are only as strong as we are united, as weak as we are divided." - J.K. Rowling
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Re: SRH velocity questions. Slow gun, chrono,?????
[Re: Chance Weldon]
#145869
06/02/2014 6:06 PM
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Joined: Jan 2004
Posts: 9,608
s4s4u
Shootist
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100 to 200 fps faster than what the manuals list Hodgdon's?
Rod, too.
Short cuts often lead to long recoveries.
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Re: SRH velocity questions. Slow gun, chrono,?????
[Re: s4s4u]
#145870
06/02/2014 6:26 PM
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Joined: Sep 2013
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Chance Weldon
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Hornady. Sorry, I thought you meant manuals in general.
Formerly TN Lone Wolf
"We are only as strong as we are united, as weak as we are divided." - J.K. Rowling
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Re: SRH velocity questions. Slow gun, chrono,?????
[Re: Chance Weldon]
#145871
06/02/2014 6:43 PM
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Joined: Jan 2004
Posts: 9,608
s4s4u
Shootist
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Shootist
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There can be some significant differences among books, which is why it is a good idea to consult more than one. I don't use Hornady's manual but do use their bullets. What do they give for a 250 XTP with H110, heavy 45 Colt load?
Rod, too.
Short cuts often lead to long recoveries.
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Re: SRH velocity questions. Slow gun, chrono,?????
[Re: s4s4u]
#145872
06/02/2014 6:44 PM
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Joined: Sep 2013
Posts: 4,669
Chance Weldon
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I'll check when I get home.
Formerly TN Lone Wolf
"We are only as strong as we are united, as weak as we are divided." - J.K. Rowling
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Re: SRH velocity questions. Slow gun, chrono,?????
[Re: Chance Weldon]
#145873
06/02/2014 6:48 PM
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Joined: Jan 2009
Posts: 9,836
Whitworth
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Re: SRH velocity questions. Slow gun, chrono,?????
[Re: Whitworth]
#145876
06/02/2014 7:15 PM
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Joined: Jan 2004
Posts: 2,399
Vance in AK.
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Pooh-Bah
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Pooh-Bah
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Yeah sorry Whit, 480 Ruger. I always forget there are other calibers!
I do apply a "heavy" crimp.
Vance in AK.
Matthew 6:33 "But seek first the kingdom of God and His righteousness, and all these things shall be added to you."
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Re: SRH velocity questions. Slow gun, chrono,?????
[Re: s4s4u]
#145880
06/02/2014 8:07 PM
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Joined: Sep 2013
Posts: 4,669
Chance Weldon
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There can be some significant differences among books, which is why it is a good idea to consult more than one. I don't use Hornady's manual but do use their bullets. What do they give for a 250 XTP with H110, heavy 45 Colt load? They don't list a Ruger & T/C only load using that powder for the 250 grain bullet. However they do list data for H4227 with the 250 XTP using 20.5 grains at 1150 fps to 25.7 grains at 1400 fps out of a 10" T/C Contender.
Formerly TN Lone Wolf
"We are only as strong as we are united, as weak as we are divided." - J.K. Rowling
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Re: SRH velocity questions. Slow gun, chrono,?????
[Re: Chance Weldon]
#145881
06/02/2014 8:25 PM
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Joined: Jun 2010
Posts: 3,020
tradmark
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one, the srh i've got 5 in our direct shooting and reloading circle and they run slower by about 100 fps vs the FA and they run about what the testing lab pressure barrels run. that said, play with the crimp a bit. i've found crimping a little in the first stage, then a second stand alone crimp that is a heavy heavy crimp allows the h110 to build up pressure and get much better velocity.
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Re: SRH velocity questions. Slow gun, chrono,?????
[Re: Chance Weldon]
#145891
06/02/2014 10:34 PM
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Joined: Jan 2004
Posts: 9,608
s4s4u
Shootist
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Shootist
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However they do list data for H4227 with the 250 XTP using 20.5 grains at 1150 fps to 25.7 grains at 1400 fps out of a 10" T/C Contender And Hodgdon shows 1150 fps with 20.0 from a 7" barrel. Surprisingly Hornady lists a higher max load, but if you extrapolate the data Hogdies would be about the same speed or a little faster, again from a 7" barrel.
Rod, too.
Short cuts often lead to long recoveries.
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Re: SRH velocity questions. Slow gun, chrono,?????
[Re: s4s4u]
#145923
06/03/2014 2:39 PM
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Joined: Nov 2010
Posts: 1,101
Bearbait in NM
old hand
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old hand
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to echo the information on the crimp, I recently tested this exact thing in a 45 Super revolver. Taper crimp v. combination taper and roll, and was seeing 75 fps difference with Longshot powder. When you consider I was only running 8 grains of powder, I though this to be pretty significant.
Craig
Northern born and Southern bred
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