MAC-1036.qxd:McMillan Ad, Varmint Hunter 11/15/11 3:10 PM Page 1 THE MCMILLAN A-5.
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exist, use a different case filling method, to change the volume occupied by the charge and thereby to assure that the charge does not fall near the “forbid- den” filling ratio of 100 percent that is apt to result in inaccurate loads. At right is a separate table that
shows how much of each tested pro- pellant that a 45-grain Hornet case will hold, both for new cases and for fired and neck-sized cases. I based this data upon the average of several tests. Accuracy of propellant-filling val-
ues is about +/-0.1 grain. Actual filling mass depends upon techniques, tools, and propellant production lot — lot-to- lot density variations of about +/-1½ percent are common. Also note: Just because it is possible to get this much propellant into the case does not mean that it is either possible or feasible to use such a charge with any given bullet or with any bullet at all. For example, spherical granules have a tendency to trap between bullet and case neck when one tries to seat a boat tail bullet on a charge that significantly fills the case. Also, when one begins to seat a boat tail bullet, the bullet base tends to displace
granules; if the charge almost fills the case, this displacement can result in spilled granules. Gun characteristics
I used the CZ 527 American for
most accuracy and ballistics testing presented here. This gun has a 21.9-inch barrel. In typical full-power Hornet loads, each inch of barrel typically yields a modest 12 to 15 fps velocity change.
© 2012
Hence, the 26-inch barrel of the Savage M-40 should produce about 55 fps more velocity, which is useful. Conversely, the Hornet is quite useful with a barrel as short as 16 inches and such a carbine could be more useful to some shooters. However, keep in mind that a shorter barrel will result in a noticeable increase in muzzle blast. Headspace of tested cases in this
APPROXIMATE CAPACITY OF 45-GRAIN CASE (AND AFTER NECK SIZING AFTER FIRING IN A STANDARD HORNET CHAMBER)
GRAINS OF WATER (CASE FULL) NEW CASE:
PROPELLANT VN310
VN110 2400
4227 (C) 4227 (A) Enforcer A No. 9 Lil' Gun 300-MP A1680 H110
POURED SWIRLED 8.2
8.5
11.7 12.0 13.1 13.2 14.0 13.9 13.6 15.0 14.8 15.3
12.1 12.6 13.6 13.8 14.3 14.4 14.7 15.3 15.4 15.6
FIRED, NECK-SIZED
POURED SWIRLED 8.5
8.8
12.1 12.4 13.5 13.6 14.5 14.4 14.1 15.5 15.3 15.8
www.varminthunter.org
12.5 13.0 14.0 14.2 14.8 14.9 15.2 15.8 15.9 16.1
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