PDA

View Full Version : Is the Rem 7 1/2 primer that much hotter than 205 m?



ballpowder
03-01-2011, 07:11 PM
The other day I worked up a great load in my 22-.100 short PPC using x-terminator
and 7 1/2 primers. Two days later just for grins I was shooting the same powder thu the different charges with 205m's and lost velocity and accuracy. But the loads I was using of H322 actually got better. What gives???

Tim J

caroby
03-02-2011, 12:33 AM
Xterminator is a double base powder and it is true that 7 1/2's work real well with ball..........
It is a hotter primer than the 205M... Bit tougher cup and just a touch less sensitive.

Both excellent primers......... You know what works best with which powder already.

Me likes the 7 1/2 with all powders............. Kinda a convert from the 205's........
cale

ballpowder
03-02-2011, 11:09 AM
These recent experienses have we wondering how much performance I have been leaving on the table with certain powders playing copycat or follow the leader with the Fed 205's? Also thought it was weird that everybody was bragging up H4198 in Waldog type cartridges but I couldn't shoot squat. (with rem primers at least)



Tim J.

Cheechako
03-02-2011, 11:41 AM
Tim

Shooting and chronographing a particular load one day and then shooting and chronographing a different combination two days later does not necessarily prove or disprove anything. To be fair, you should shoot and chronograph both combinations on the same day under the same conditions, preferably including a known test standard cartridge. Even then, you have to shoot more than 5 or 10 rounds of each to even begin to make any assumptions. Otherwise, all results that you end up with are anecdotal at best.

JMHO

Ray

ballpowder
03-02-2011, 06:01 PM
Excellent idea! I mean I thought of that also but a good ole head to head experiment with the primes sounds like a lot of fun. Good thing the primers can't speak or they each would cry for a .2" handicap because of the mentally handicap shooter!

Tim J.

Boyd Allen
03-02-2011, 07:38 PM
I have come to understand that most primer tests are flawed. There is some thought that accuracy nodes occur at particular velocities, yet when primers are switched, typically, there is no powder charge adjustment made so that the loads produce the same velocity. Then, with great gravity, it is announced that such and such a primer was not as accurate. In the past, I have done it myself. IMO these tests are best done loading at the range, so that adjustments can be made, on the spot, to produce the same velocity.

caroby
03-03-2011, 11:07 AM
These recent experienses have we wondering how much performance I have been leaving on the table with certain powders playing copycat or follow the leader with the Fed 205's? Also thought it was weird that everybody was bragging up H4198 in Waldog type cartridges but I couldn't shoot squat. (with rem primers at least)



Tim J.

I too......... I have found that during the cold months the hotter primer is needed.... You in Alaska......... Much longer "cold" than me here in the southern lower 48....!!!

The two lotts of 7 1/2 I have currently 20k total... Compair without any deviation I can see.. I believe these are as consistent as Fed 205 / 205M just hotter and will handle a hotter load...

Think you'll be pleased...
cale

Vern
03-03-2011, 05:55 PM
Last year I purchased a 1k box of 7 1/2 s and shot some with poor results and went back to federals. HOWEVER at the beginning of the season this year I opened the box and thats when I noticed the ones inside were marked 6 1/2. No wonder they didnt shoot so well.

Joe Maisto
03-04-2011, 10:26 PM
Happy to read this article on 7 1/2's. I've had 3 thou. for the past 10 years in my cabinat just sitting there. Maybe now I will use them.

Vern
03-05-2011, 09:51 AM
Joe, after 10 years I am sure those primers are expired. However Ill dispose of them for you and even pay the hazmat fee if you want to send them to me.

Joe Maisto
03-05-2011, 07:23 PM
Vern;

That is very generous of you, especially in being willing to pay the hazmat fee. I will take some to the local range for my Ruger #1, .223. If I can get 9 out of 10 to go bang, the deal is off !

jackie schmidt
03-05-2011, 09:40 PM
I agree wholeheartidly that the primer is just one part of the equation.

Just because a primer is "hotter", or "colder", does not mean that it will shoot tighter groups, give better SD's, or anything that pretains to Rifle performance. Every powder-bullet-barrel-primer combo likes a certain thing.

I will admitt, the main reason I have always used 205's is because that's what everybody else uses, and they do seem to work quite well in chamberings that are specifically used in point blank Benchrest.

Years ago, a certain shooter in the Houston Area used nothing but Remington 7 1/2's, mainly becauase they were supposed to have a harder cup, and he thought 3450 was the "mid window".........jackie

jo191145
03-06-2011, 05:55 AM
ballpowder

I noticed your from Alaska.
I use X-Term in the 6PPC with F 205m's. Temp goes much below 32 degrees and it absolutely just stops shooting.
No idea what temps you shot in just an FYI on my expierience.
I have wondered if a hotter primer might bring it back. Never tried.

ballpowder
03-06-2011, 12:05 PM
Jo191145: While it is very mild in my part of the state (most southern town, just north of Seattle and West of B.C.) it was 27 then 26 deg the two days this happened. I never meant to imply that the Rem primers were better but, instead wanting to know why groups were that much better with spherical Ramshot powder? Also the residue was far less with 7 1/2's than 205's. I assumed a hotter flash burned the powder out more completely??? I intend to really run this powder through the ringer this week as it has warmed dramaticaly now here. Will post anything worth noting.


Tim J.