Small rifle vs large rifle

Except for working up a "precision" load for a single rifle to use for long range varmints or informal competition I don't worry about difference between small and large primers. My bulk training loads and multi-rifle hunting loads pull a big bag or several boxes of prepped brass, refer to my data for bullet using and go to work. Someone mention match primers, most manufacturers including CCI and Federal say the only difference between standard primers and match primers are match primers go through one extra inspection step. Considering standard primers go through a half dozen inspections one extra step doesn't mean much, many I know (including David Tubb/Superior Shooting Systems) are using Russian primers in precision ammo.

According to Federal the only difference in the regular Federal primers and the match primers were an extra visual inspection.

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Many manufacturers the difference between military and magnum primers is the box. Unless I have a "pet load" that is well above any published chart data (here I use same primers used for load development) any loads that are in the real of published data I don't care if goes in a large primer or small primer case or what type primer I stick in it. Given the choice (don't have his with 6.8) most of my precision loads go in Berdan cases and use Russian made Berdan primers.

In general, there is no significant advantage to using match primers rather than standard primers. While primer manufacturers often say their match-grade primers have additional quality control checks, most shooters are not able to see any advantage, but there are differences in how all primers work.

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The CCI #41 is ballistically equivalent to the CCI 450 small rifle magnum primer

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There will be no functional difference between standard and magnum primers. Winchester primers are labeled, "For standard or magnum loads"

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Spend about an hour with Google and dig into both manufacturer sites and discussion forums of reloading and precision shooting sites will find some claim small differences but nt enough to really worry over. Federal claimed "Federal Match primers are made by employees who've shown a greater ability consistently apply the priming compound" but I cannot find any such reference on their website in recent years. Best I can tell are magnum and military primers both have thicker cups and some claim a bit more priming compound and are basically the same thing.

In running loads across the chronograph I do;t see enough difference between standard, match and military primers with all other elements being equal that exceed standard deviation of using the same primer. If your running up to max load or beyond I would always be careful even using the same brand and type primers as there can be more differences between Brand X standards lot made a couple years later as their equipment or materials may have slight variance. That said still will be within their "allowable tolerance". Have seen a lot of detailed testing of primers and for most ammo loading purposes the primer used makes no difference.

If your building precision loads for 1,000 yard benchrest or 500 yard prairie dogs you need to remove evey bit of tolerance stack possible. I find most of that is done by properly prepping and matching cases and again properly prepping and matching projectiles. If you do not cut every primer pocket to same depth using a cutter then make sure all flash holes are centered, same size and deburred you will se much more variation from the actual primer pocket than the primer stuffed in it. Same with bullets, trim, tip and weight matched projectiles will remove more variance than using a different primer.

My precision loads spend way more time prepping cases and truing bullets than worry about primers. Just separate your large primer and small primer brass and then after loading box the smalls together and large together and let fly. May as well jump into the debate on is powder volume or weight more important. Many believe measuring by volume is more precise than weight of powder charges. I find the type powder some shoot better if measured by volume and others shoot better if measured by weight but at most ranges and in most rifles the difference wont be seen. A $800 single point cut rifled barrel on a precision build being used at 1,000 or more yards then you may find one primer exhibits better consistency but at 100 yards from a $250 barrel the primer is not going to show much variation.