what would i gain with mag primers over LP primers going with H 110 250 gr xtp ??

Not a dang thing, IMO.

Nada...

I have used them, but I cannot vouch for any difference. Did not chrony the loads, but If it is at all different it can't be by much.

There is a topic over on the cast boolits forum right now concerning this very thing, only for the .44 mag.

The long and short of it is that you will get zero increase in speed with a mag primer and H-110/W296 but will suffer reduced accuracy.

I did some personal testing this week on my .44.
320gr cast boolit, 21.5gr H-110

I shot groups with that load using a CCI350 LP Mag primer and Federal 150 LP primers. The standard primer groups were noticeably smaller.

I bought one of the first Ruger Blackhawks in 45 Colt that hit the market back in the early 70s"

I was using a load (a heavy load from a Hodgdon technician which wasn't published yet) of H110 and large pistol primers. I had a handful of "poofs" (two of which stuck bullets in the barrel). I called Hodgdons and they ask about my load. They told me to switch to mag primers..................problem solved.

Some say that mag primers are required to set off the H110

yes i was told to run mag primers with h 110 to so going to try it out i am using them in 44 mag 24.4 gr of 110 240 gr xtp mag primer they shoot great 1 to 1 1/2 groups at 50 yrds thanks guys for replies just geting started but liking it !

I have been using Win LP primers in the 45LC (250XTP) and 480R (325) with 25 grains of H110 since day one and have had zero problems.

that my be s4s4u i will try both . did u have powder res in cases or cylinder?

The wlp primers say for standard and mag loads.I would think 24 or 25 grs of H110 would need a hotter primer,just my thoughts.

If you read up on the Win LP primers you'll see they are designed as a dual purpose primer good for std and mag loads which is why Win dosn't mag a LP Mag primer.

As far as everything else goes if you look at load books that are detailed and show multiple powders and charges for a specific cartridge and H110/W296 is on the list in the footnotes it will tell you to use mag primers and the primary reason for that is the load density common with those powders and reliable ignition of the charge. Just changing brands between primers can change pressure and according to one test I read about the pressure changes were up to 6000psi so when you go back and fourth there will be changes in velocity and accuracy no matter how small. Back to the load manual deal, I was cooking up some hot loads for my 44spcl the other day and every place I actually found the data I was looking for would say to use LP primers "except" with H110 and 296. Something else to take into cosideration, the tests ballisticians do to give you that information came after hours of testing in all kinds of cartridges, weapons and environmental factors. A good example is that common sense says that most likely a compressed case of H110 is going to ignite more easily on a warm spring to hot summer day when most of the armchair ballisticians including myself to an extent are shooting but what happens when the temp drops to below freezing? Will the standard primer still be as reliable and as "consistant" as the mag primer in ignition? Anyways I find it much safer and better to trust the guys getting paid to do the proper testing and research on the matter.

So why use any other primer other than WLP then ;-)

actually until the primer shortage caused when "they" elected that commie to office that was all I used. It was nice because with stuff like the 45 where I was loading hot stuff with H110 and mild stuff HS6 I could prep all the brass at once and not have to worry about changing primers. The Wins are apparently hotter than other std primers. When I wanted to stock up all I could find were CCI's so now I have a almost three bricks of those to use up but at least I bought them on sale.

thanks rod makes sens i to read this on load data...

NO res, it burns clean as a whistle. I was equating the original question to any performance gain, which would be little to none. I have only used WLP's and was unaware of issues with "poofing" with some primers. If that is the case I would use a mag primer whenever it is available, but I have had no probs with WLP's.

yes i think to be safe i will go with mags no gains or loses .

I highly recommend the Winchester WLP's s4s4u was talking about. They are more versatile as you can use them in magnum or standard large pistol loads which means it's easier to stock up and one less thing to keep straight. I will interchange primer brands but as long as your not starting with max loads your fine. I think I mentioned a study I read that showed pressure variations between the same loads with different brand primers but if you start out like your supposed too and work up you'll be good to go. Right now I'm working through a bunch of CCI LP's and LPM's but when I start buying primers again I'll go back to the Winchesters, I just wish they could do the same with rifle primers.

i load 44 mag so been using cci350 mags so have alot on hand but just geting started with 45lc so thanks guys for pointing me right .lots of load data but some dont give primer . but h110 likes mag primers and thats what iam using . h4227 is gone from hogndon. and got all u guys saying 110 so i do like it in 44mag 24.4 gr 240 xtp mag prim love this load. now working on 45s.....

Hodgdon does specify the WLP in their 45LC +P data for H110, but your mag primers should work fine although I wouldn't start at max charge.

I use CCI 350's in all the hotter loads and WLP's for some of the cast and pliker's loads.

I think the CCI 350 will help a little @ low Temp. < 30 deg.

I’m a little confused with the term large magnum pistol primer. It’s my belief that the only difference between standard and magnum primers is cup thickness – I got this from a fed tech in an e-mail that I sent asking for the difference between the fed 150 & 155. Remington indicated as much in their e-mail.

The thicker cup is suppose to be used in the high pressure loads to aid in avoiding primer piercing.

The CCI350 is a different creature altogether, as it's a true magnum large pistol primer and will up your peak pressures over the other magnum large pistol primers according to John Linebaugh, who found that to be the case when he was testing primers in a pressure barrel for his calibers.

If I think I need a magnum large pistol primer for cold weather I will only reach for the CCI350, as I know that primer is a hot one. My go to primer has always been the WLP – just cause.

I wish someone with the correct instruments would take apart the standard and magnum primer and measure the mixture.

The ballistician for Accurate/Ramshot told me that the only pistol primer that showed a significant pressure difference in their testing was the CCI-350. That being said, I have used Federal as my go to primers for over 45 years. Too old to change now.