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by K-Texas
Wed Oct 09, 2019 2:38 pm
Forum: Reloading Forum
Topic: Projectile question
Replies: 9
Views: 1430

Re: Projectile question

Well, we really don't have a convenient location to shoot gun games, but I've been working on a comp load, anyway, with AA No 2. Great accuracy and light recoil. It is an effective bullet for defense loads up to 1180 FPS in my tests.

Most 9mm Minor comp shooters seem to prefer 147s for a lower perceived level of recoil. With this load I've been working on at +/- 4.2 grs. of No 2, I don't know how recoil could be practically lighter at 130 PF to allow a bit of cushion for firing over anyone's chronograph.

I was shooting and handloading for Magnum revolvers before I decided to pursue greater accuracy from 9mm handloads. Back then, foreign and bargain 9 x 19mm was so cheap that not many bothered handloading for it. And as such, I never really considered a lower recoil load.

As I mentioned, pistols with shorter chambers will require a shorter OACL with the RMR 124 gr. JHP. For those pistols I load to 1.085" and just a tad longer than Sierra and Lyman loaded with the 125 gr. Sierra JHP, so either manuals data works well. I've been using a Canik TP9sa for handload development originally, but now I find myself using it for more options. It has no OACL restrictions, so I am able to load that bullet to 1.122"/28.5mm. In the link I posted for the article on the Western Powders blog, I covered the technique for finding the correct OACL for the specific bullet you handload for a specific pistol. Hopefully it will benefit those who have questions regarding that. ;-)
by K-Texas
Wed Oct 09, 2019 12:52 pm
Forum: Reloading Forum
Topic: Projectile question
Replies: 9
Views: 1430

Re: Projectile question

Why I will say it's not alright. Jacketed bullets will fluctuate in weight. As long as it's by decimals of a grain it's not a big deal. Undersize, or even oversize can be a problem. The bullet used in the handload data was very likely .355" and if you load a larger diameter bullet, pressure increases. How much? That depends on the extra diameter. The issue with under-diameter bullets becomes a greater concern. After seating and taper-crimping, the bullet is held in place by case-neck tension. Your dies are made for a specific dia., and if you use undersized bullets, they may not get enough case-neck tension. This can lead to set-back: the bullet being seated to an even greater depth upon making contact with the barrel's feed ramp. It doesn't take a great deal of set-back to increase the cartridge's pressure dramatically. Some load manuals are better than others in explaining this.

If I ordered bullets where the dia. was stated as .355" but as small as you mention, I'd send them back. A good deal is more than just about price. Find a company that delivers what they state. Another thing for me personally; in 33 years of handloading I've rarely used FMJ bullets when a JHP is about the same price. One discount bullet I can recommend as being uniform is the 124 gr. JHP made and sold by RMR. The downside is that due to the nose, or ogive, shape, they need to be seated a bit deeper than others. They are, however, compatible with Sierra and Lyman data where the Sierra 125 gr. JHP is used. Another very good bullet is the 124 gr. JHP from Everglades that allows longer OACL. When I haven't loaded JHPs, I've loaded .356" dia hard cast, and now poly-coated bullets. Remember that in order to avoid leading the barrel, the cast lead bullet will need to be .001" larger than the barrel's groove dia. Since you use an oversize bullet, the case mouth that got a slight flare in expanding will only need the case-mouth returned a nominal dia, Taper crimping is not necessary with cast and poly-coated bullets. And if you like an FMJ profile, one can be had. I've been very pleased with bullets from SNS Casting. It is very much worth the small increase in price to buy the poly-coated version of a hard cast bullet.

Some of the opinions you will hear about taper crimping are vastly overblown. It ain't magic, and I would recommend one that isn't advertised as a magical solution. The best I've used is the separate taper crimp die from Redding, and it's certainly more than about the brand, and it's not expensive. They are made exactly as they should be. I can explain in depth if need be, but it works in 2 phases. One to get adequate tension on the bullet where the die has the main taper that acts only on the case-neck. Then there's a much smaller secondary taper that acts strictly upon the case-mouth. Some reloaders get overly concerned about improper headspacing possible if too much taper crimp is applied. It's a bit of paranoia considering how far you'd need to reduce the dia of the case-mouth to keep it from headspacing. at .002" or less of taper crimp, the case-mouth is no where near undersized and to apply so much taper crimp that would prevent it from properly head spacing would cause significant deformation of the bullet. I have written a number of articles on the 9 x 19mm, and one specifically on the geometry of getting it right that you will find here: https: https://blog.westernpowders.com/2015/11 ... e-success/ ;-)

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