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General >> Ammunition, reloading, shooting, etc >> .310 FMJBT bullets for larger bored rifles
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Message started by madsenshooter on Jan 9th, 2018 at 7:10pm

Title: .310 FMJBT bullets for larger bored rifles
Post by madsenshooter on Jan 9th, 2018 at 7:10pm
Speaking of bored, the winter doldrums have set in, I've nothing better to do than physically compare a couple 174gr FMJBTs that are available to us.  After having some success with the 174gr FMJBTs that I pulled from Russian made .303 British, I thought I'd check out a couple of commercial offerings.  So, I ordered 100ea of PRVI and Hornaday's offerings.  The Hornady offering measures pretty close to as listed, I get .3103". PRVI bullets are about the same and both are very consistent in this dimension.  Weight-wise, the Hornady bullets were very consistent, ranging from a low of 173.3gr to a high of 174.2gr.  Over 40 out of the 100 weighed exactly the same 173.6gr.  The PRVIs were not as consistent, weight ranged from 173.1gr to 175.8gr with a good concentration in the range 174-174.5.  Still a lot less variation than I experienced with their 190gr HPBT bullets.  It must be easier to maintain consistency when stuffing the jacket from the rear.  The Hornady is a secant ogive design, the PRVI a tangent ogive.  The Hornady will have a bit less jump to the rifling if loaded to same OAL as the PRVI and has a longer bearing surface.  BC of the Hornady is listed .470 and that of the PRVI was calculated by Parashooter as .492.  the PRVI has a slightly sharper boat tail and a rounded annulus.  The Hornady has the same sharp jacket edge at the rear that the 150gr FMJBT has.  The meplat is a bit smaller on the PRVI, might help feeding.   Perhaps I can get out sometime before spring and give them a bit of a shooting test.  I'd really like to find the RL19 that I have somewhere in these boxes!  Both bullets are close in length to the Russian 150gr steel core bullet.  My goal is to take away some of the time of flight advantage that the 06 has over the Krag.  Whether or not that will really make a difference, I can't say.  L-R, Russian 150gr, Hornady 174gr, PRVI 174gr.
173gr_002.JPG ( 61 KB | 0 Downloads )

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