Home Forums Hunting & Shooting Ask The Gunwriters magnum vs standard primers for 300 win mag

There ARE no problems with mag primers. I was just relating what the Federal Engineer said and in my 375 and 338 with extruded powders, the accuracy improved with the 210s over the 215s. With my H-414 load in the 375, the 215s worked best. I don't know what the confusion is here.

Of course they are not parallel if by parallel you mean equal. My preceding post was my observation and validation of what the Fed Engineer said.

The most ridiculous yet funny thing I have read in a long time

Sarcasm is sure hard to read!!!!

Some people take this [bleep] too serious.

This makes sense.

I never paid much attention until a few years back when a friend called and said he had been chronographing a bunch of ammo loaded with RL22 and 130's in the 270. Rifle was a Ruger M77. He noted that at low velocities it seemed to shoot fine....but when he got near typical 270 velocities (over 3000-3100 fps),accuracy went to hell; and the velocities were jumping around varying 30-40 fps.

I was stumped but asked about the primer and he said it was a CCI standard....thinking it would not matter, I suggested trying a Fed 215 and attended the next shooting session. The change was dramatic in velocity variation....and accuracy....the rifle became a drill with RL22 and the 215. I have never seen a primer make as big a difference.

Curious, I dug around and discovered that the Old Boys like JOC shot those heavy charges of H4831 with CCI250's in the 270 Win...Mmmm.

I don't make a habit of using mag primers in standard cases, but I do when I load RL22 in the 270 Winchester.

BobNH -

YEP but I'd like to make 1 observation

CCI didn't change the mixture in the 250 primer till 1989. Post -JOC writing.

OTOH - it was in the 70-80s I was reading everything I could get my hands on per loading.

My GO-TO 270 load became 62grs 4831 (surplus) w/magnum primers.

That was UNTIL my primer testing---then I switched to WW (old-only 1 primer from WW) .

Even AFTER Win brought out their WLRMP they showed no diff from Win's older primers.

My point being -- WW's old primers were hotter than OTHER primers <<NOT counting Federals!!

I have YET to see Federal primers on a shelf where I bought/buy components. You can't test what you don't have.

Just an observation from my experience.

jwp: I guess they did not have the choices back then that we have today....probably used what they thought was the hottest around. Can't really say why and JOC is long gone.

Maybe JOC living in the same town (Lewiston, Idaho) with Vernon Speer and CCI, had something to do with it.

Never had a lick of problem myself with H4831 and WW primers....even when burning 8.5-120 Staynless primers. With H4831 today I use WW STD LR primers in 270/30-06 etc, unless, as stated, I use RL22,7828,or RL25 in the 270 Winchester and then use Fed 215....they just work and accuracy is not a problem.

I did a test with all my 270's a while back with 60 gr of H4831 and 130gr Barnes TSX, TTSX, Hornady 130gr GMX, and Interlock.

All the same loads and used WLR and WLRM primers. In every instance with 8 different 270's the WLRM loads shot better groups, were faster and had better chronograph numbers.

I now keep those four loads RTG in my ammo stash and whenever I happen into a new 270 I go to the range and see which one shoots the best. Almost every time I can find one load that is hunting suitable at 1" or better, sometimes two.

There was one 270 that would not shoot any of the eight loads when tested. The smallest groups were about 2.5 inches with the WLRM and some over 6". It went down the road.

So from my non scientific experience, I would certainly start with magnum primers and change to nonmagnums if I could not get satisfactory groups.

crs -

Your testing sounds like you are using NEWER WW primers than I did & have.

Your tests sound good & very comparable.

Are those WW primers Brass or Silver colored. Just curious.

Thnx
Jerry

WLR- silver
WLRM-brass

crs -

THNX, the reasons I asked,

1. Your mag primers TODAY are different from std primers today.

2. I have 1-2 boxes of WW 6.5X55 factory ammo. The primers are brass. ???

Well.... I'll never know.... I don't buy factory ammo.

THANK YOU.

Jerry

CRS that's interesting....I was never that organized about it.

We tend to grab what we used in the past; and get hung up on certain powders....H4831 and the 270 being classic examples. Good no doubt; but some of the newer,slower powders can incrementally boost velocities in the 270,things like Magpro, RL25,MRP, etc. I think these will do very well with a mag primer torching things off.

If I get around to working with that new 150 gr LRAB, I will likely start off with 7828 or RL25 and a Fed 215 to see what happens.

I don't know if I would call it organized so much as saving load work up time.

I am a true 270 slut and have owned, sold and traded too many to remember. I love experimenting with different combinations, but it is nice to have solid loads to fall back on.

I do have to work up a load for my 12yo son's 270 this year. He is not comfortable with full power loads yet. Going to play with 110gr Accubond, 120gr SST and 130gr BT and possibly a 110gr TTSX. I will use one of the faster 270 powders with a standard primer to start with. Going to shoot for a 2700-2800 velocity range.