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Rifles, Reloading, Optics, Equipment
Reloading
PRIMERS: Magnum or Standard for 6.5 PRC
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<blockquote data-quote="emp1953" data-source="post: 2268531" data-attributes="member: 71817"><p>Some powders perform better with standard primers some with magnum. Since you seem to have a stockpile of both load up some samples and shoot them over a chronograph. I've had wide discrepancies between the two, using the same powder, also had wide discrepancies from caliber to caliber so I think that "all" the factors make the difference. Internal case volume, bullet type/weight, powder, caliber. I hunt with a SIG970SHR in .270win. I ran out of standard primers and loaded up 10 rounds with the mag primers. My load was 51.2grs IMR4350, CCI200 primers, 150gr Nosler ABLR. My half inch at 200yds rifle became a brick. 4" group at 100, velocity had almost 100fps SD. I bring a reloading set up in my truck that slides into my trailer hitch receiver. So on the spot I started to work up a new load. Listed max is 53gr of IMR4350, that gave me pressure signs. Dropped back 1/10 gr at a time and settled on a node at 50.1gr. Didn't give me my 1/2 inch at 200yrds but was pretty good. The standard primer load had the bullet .020 off the rifling. Fidgeting with this I found .024 made the round/rifle combo happy, I was very close to my 1/2 inch again. The previous load had a chronographed velocity of 2884 fps. this new load was much lower at 2710fps but was very consistent. Other guys at the range stated that they didn't see any difference between overall performance of standard and magnum primers. In this case I did.</p></blockquote><p></p>
[QUOTE="emp1953, post: 2268531, member: 71817"] Some powders perform better with standard primers some with magnum. Since you seem to have a stockpile of both load up some samples and shoot them over a chronograph. I've had wide discrepancies between the two, using the same powder, also had wide discrepancies from caliber to caliber so I think that "all" the factors make the difference. Internal case volume, bullet type/weight, powder, caliber. I hunt with a SIG970SHR in .270win. I ran out of standard primers and loaded up 10 rounds with the mag primers. My load was 51.2grs IMR4350, CCI200 primers, 150gr Nosler ABLR. My half inch at 200yds rifle became a brick. 4" group at 100, velocity had almost 100fps SD. I bring a reloading set up in my truck that slides into my trailer hitch receiver. So on the spot I started to work up a new load. Listed max is 53gr of IMR4350, that gave me pressure signs. Dropped back 1/10 gr at a time and settled on a node at 50.1gr. Didn't give me my 1/2 inch at 200yrds but was pretty good. The standard primer load had the bullet .020 off the rifling. Fidgeting with this I found .024 made the round/rifle combo happy, I was very close to my 1/2 inch again. The previous load had a chronographed velocity of 2884 fps. this new load was much lower at 2710fps but was very consistent. Other guys at the range stated that they didn't see any difference between overall performance of standard and magnum primers. In this case I did. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
PRIMERS: Magnum or Standard for 6.5 PRC
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