LR vs. LRM primers

[NHSHTR]

In researching loads for the 270 WSM, I've seen that Alliant specifies LR primers, not magnums for their RL19 and RL22. But my Lyman Reloading manual specifies a LR mag primer for its entire list of 270 WSM loads.

I loaded 12 rounds of 66 gr of Reloader 22, Hdy 130 gr JSP using a mag primer and an identical load of 12 except they had a LR primer to see what impact or grouping difference there might be.

Well, at 100 yards, I was surprised to see no real difference between the groups at all. Each group of 3 was MOA. The impact points of groups were similarly within 1.5 MOA. So no significant difference seen.

Now this was a small sample, I only used one type of powder, and only shot out to 100 yards, but has anyone else found another powder that is specified with mag primers in one table and regular primers in another manual or table? Has anyone some experience in doing this out to 200 or 300 yards?

 

[Visionz45]

Ive worked with RL22 in my .30-06 with CCI 250, WLR, and WLRM primers without noticing any difference in performance(negligible velocity diffs), the original RL load I found in hand loader magazine specified magnum primers though I just looked at all new manuals and they show LR primer. Ill try to find that copy and get its number. I went up to 62.5 gr. under a 180 accubond without issue.

 

[JimKirk]

No test experience at longer range, but I have noted in many of my past post that most of the time...you will not see any difference with any normal rifle load. If you are at the maximum end of a load you may see some pressure signs. If you are loading rifle cartridges with a small powder capacity or small capacity pistol loads, then you would need to watch what primer to use. Real cold weather would be another case too.

I have shot 243, 25/06, 270 Win, and 270 WSM all with both magnum and regular primers will very little difference at all.

I just think that there is too much hoopla over rifle primers ....

Jimmy K

 

[dirtman]

Up here mid Canada it gets cold, i think the coldest i have ever hunted was -45 and with the wind it was -65.... I like 748 and have always had good results with it... but i always load it with a mag primer.... it makes a heck of a differance in cold weather... If you are anywhere near zero degrees you should use a mag primer with ball type powders .... just my 2 cents

 

[NHSHTR]

I would think there has to be some difference in performance. Whether that's temperature, distance or powder type.

 

[Seedtick]

Brrrrr!

...i think the coldest i have ever hunted was -45 and with the wind it was -65....

I'm thankful that I've never been hungry enough to have to hunt when it was that cold.

Brrrrr!

I think I would rather eat the top out of an old work boot.

Brrrrr!

ST

 

[dirtman]

Seed,

I can only sum it up this way..... I am not as dumb as I was in them younger days.... as I would put on the cross county skis and go out to find coyotes and the odd wolf. Mostly just freeze your a** off... Sometimes if you had lost a calf it would make good bate, if put out in the bush.... especially if put down in a ravine with some trees and shelter..... you could actually get comfortable... But then i found Florida was a wee bit warmer... and gave up on the winter (Brrrrrr) hunt stuff....