6mm Bullet Weights that Will Stabilize in a 13.5-twist Barrel
- Thread starter South Pender
- Start date
That's good to know. Is the 70-gr. Sierra you've used the Match King? I believe all Sako 6 PPCs have a 1:14 twist. I've owned two--the heavy-barrel BR model and a repeater--and both had the 14 twist. I never shot anything heavier than 68 grains in either. The 70-grain Sierra Match King is .834" long, and so I think any bullet of that length or less should stabilize in my 13.5 twist barrel. This includes a couple of other 70-grainers and possibly a 75.
Scroll down to 6PPC and Sako:
https://www.gscustomusa.com/twistratebymanufacturer.html
This agrees with the twist measurements I performed on my two Sako 6PPCs.
The 7th Edition Hornady Handbook of Cartridge Reloading in the 6mm PPC section, show their test rifle having a 1-14" twist, and stabilizing up to 70 gr projectiles. In their instance, #2410 SP, and #2415 SPSX (Discontinued) respectively. The #2410 Spire Point is .799" in length. I'm including a link, which hopefully is within the rules...
https://www.jbmballistics.com/ballistics/lengths/lengths.shtml
It is a compilation of bullet lengths from various manufacturers. Beside the names of the manufacturers, is a number showing the percentage of how much of that particular manufacturers product line has been measured. Hopefully this will be of some help.
https://www.jbmballistics.com/ballistics/lengths/lengths.shtml
It is a compilation of bullet lengths from various manufacturers. Beside the names of the manufacturers, is a number showing the percentage of how much of that particular manufacturers product line has been measured. Hopefully this will be of some help.
Yes, that is a very useful source. It is the list from which I got the previous bullet length information and mentioned in Post #10.
The staple in a 13 or 14 twist in the Benchrest competition circles are anywhere from about a 62 to 68 grain bullet. Now depending on the climate, temperature, my personal opinion is to use nothing slower than a 13.5 twist up here in Canada. In theory, or my thoughts, nothing worse then having a 68gr bullet working in a 14 twist in the heat of the summer and marginal in the cooler temps. This is just my thoughts. I know of one person in Canada who has shot a TON of 6PPC testing, practicing etc. And if memory serves me right no issue with a 14 twist. Now this I am talking is in the competitive circles with custom actions. These are loads with VV133 and a damn full case powder. Running 3400+ fps. I have run as high as 34.5 of 133 in my BATS but beyond that I get into stiffer bolt lift. The PPC was never designed or developed to shoot heavy bullets. It was designed and developed by Pindel and Palmisano as a BR cartridge. Granted the PPC does and has not lost at Rosebuds King of the Hill 500M match if my memory is right. There are those who have tried the 6PPC with bullets over 100gr with the right twist successfully. Some are even necking up to 30PPC's for score shooting.
Side note, when I talked bullet weights, these are Custom bullets. I never think Nosler, Hornady, Sierra etc in a PPC. Just the boutique bullets......
Side note, when I talked bullet weights, these are Custom bullets. I never think Nosler, Hornady, Sierra etc in a PPC. Just the boutique bullets......
That makes sense for serious BR shooting. Beyond Bart's, Berger, Killer Bees, what boutique 6mm bullets are available to us in Canada in that 62 to 68-gr. range?
Unfortunately not a lot. Most of the serious guys have there own swaging setups. The few of us who do not have a few people who are smaller and fortunate to furnish those of us who compete with bullets. That is about all I can say on that.
