6.5 Creed small primers

[khuber84]

I wish they would publish their results. I'd like to see how in depth it was. I find it very interesting.

There's a thread over on accurate shooter where a couple guys tested various flash hole sizes and said that 0.060 was good, 0.070 was bad, and 0.080 was good. Give me a break. If the results were really different and not just noise, I'm sure it's just that particular load.

I can't see it making a ton of difference except for the extreme scenarios: very thick case head (long flash channel), very low case fill, extremely cold temp, etc.

I'm sure there sample size was rather limited, as all the groups on accurate shooter are. But......you cannot argue with 10 shot 1/3 to 1/4 moa groups at 1k yards on paper. I feel those guys are likely better rifle tuners and reloaders than true marksman. I know some benchrest and f class guys, they even agreed with my opinion.

 

[Gorp2007]

I’ll throw in an update now that I have a chronograph.

I switched from mixed LRP (mostly Hornady) to Alpha SRP and didn’t notice any change in group size at 100 yards, but I lost about 100 fps with the same reloading recipe. Full load data is below. Same batch of bullets and powder, loaded within 24 hours of each other.

140gr ELD-M
40.0gr H4350
2.740” COAL

LRP - 2599.1 fps
SRP - 2494.0 fps

The LRP group was only 5 shots and I’ll keep collecting data on those, but the SRP loads are giving me single digit SDs over 10 shot groups so I don’t plan on going back any time soon.

 

[HighUintas]

I am getting about 2530fps with my 21.75" Tikka 6.5cm with CCI450, 140 match burners, starline SRP, and 40gr h4350.

Sounds similar to yours.

 

[mtnbound]

Here is a good little experiment from the guys over at Vortex testing small and large primers and temperature effects.