are readily achieved. With its 4-inch longer barrel, the
Savage M-40 can equal CZ performance even with somewhat reduced loads, as might be necessary to extend case life when using this gun with its rear- locking action. headspaCe and rimmed Cartridges — saami style
SAAMI specifies Hornet rim
thickness at 0.055- to 0.065-inch. This represents Hornet cartridge headspace datum. Similarly, SAAMI specifies chamber rim cut for Hornet-chambered guns at a depth of 0.065- to 0.072-inch. These figures represent chamber head- space datum. My math skills are not all that
good but even I can figure out that a minimum thickness rim in a maximum depth chamber will have a whopping 0.017-inch headspace. With the thin walls of typical Hornet cases, even far less headspace is apt to result in a case separation upon firing. And, even if cases do not separate on first use, separations are inevitable after only a few uses with any loads that generate normal performance. Further, accuracy is apt to be dismal, especially with any load that generates anywhere nearly normal Hornet pressure. Therefore, stating this as gently
as I can, SAAMI carelessness in codify- ing Hornet headspace datum is rather inexplicable. In rimmed bottlenecked cases it
is usually possible to move headspace control to the case shoulder by neck siz- ing only or by using the correct Redding Competition shellholder (where avail- able) during full length resizing (so that sizing does not push the case shoulder back unnecessarily). Adjusting the FL die so that it does not quite touch the shellholder is a poor method for most cartridges but can work all right in the Hornet and similarly easy-to-size cases. However, in the Hornet, transfer-
ring headspace control to the case shoul- der proves to be a useless enterprise. The extremely thin case walls and extremely narrow and shallowly angled shoulder easily allows the combination of firing pin impact and primer explosion to drive the case into the chamber until the case rim abuts against the chamber rim cut. Subsequently, as chamber pressure builds, the case walls expand and bond to the chamber and then the case head
PROPELLANT TESTED CHARGE FPS @ 15’ STD. DEV. ACC. (IN) 300-MP
Lil' Gun H110
A1680 2400
4227 (C)
15.6 14.5
33 GRAIN: SPEER 3,358
*15.5 15.4 13.0 13.8
3,123 3,581 2,985 2,981 3,176
34 52 14 8
26 8
0.7 1.3 0.3 1.5 0.7 0.7
15.3 grains is likely maximum. When using a conventional die, this bullet is unusually difficult to load because it is so short.
35-GRAIN BERGER HP (MOLY PLATED): 45-GRAIN CASE OAL: 1.925 inches, which exceeds SAAMI maximum 22-Hornet length by 0.205-inch: For loads where length must conform to standard Hornet cartridge length reduce charges about 1 grain. In the CZ test gun, these loads had 0.020-inch bullet-to-rifling jump with only 0.065-inch seating depth. Longer loads are not feasible.
35-GRAIN HORNADY V-MAX (MOLY PLATED): 45-GRAIN CASE OAL: 40/1000-inch shorter than SAAMI maximum, 1.680 inches. These loads had 0.020- inch bullet-to-rifling jump. Seating these bullets to give between 5/1000- to 20/1000-inch bullet-to-rifling jump gives a shank-seating depth between about 0.115-inch and 0.130- inch. Such seating depth tinkering is feasible and desirable for improved accuracy.
PROPELLANT TESTED FPS @15’ STD. ACC. CHARGE
300-MP Lil’ Gun H110
A1680 2400
4227 (C)
35-GRAIN: BERGER, HORNADY DEV. (IN)
COMMENTS
15.6|15.0 3,351|3,300 38|32 0.4|0.7 Inconsistent 1.71 OAL 14.5 3,118|3,138 42|48 0.6|1.5
15.5|15.4 3,550|3,476 17|14 0.7|1.0 15.3|15.2 maximum 15.4 3,014|3,020 15|15 0.5|0.8 13.0 2,967|3,020 25|34 1.2|1.6 13.8|13.7 3,151|3,136 14|10 0.5|0.7
None | String Recoil is noticeably less than loads using 40-grain bullets.
The 35 Berger HP shares the same jacket and shape as the 30- and 40-grain Berger HPs and, therefore, has a fair BC. Loads in the 3,500 fps muzzle velocity range will certainly carry explosive velocity to about 220 yards.
The 35 Hornady V-Max shoots very accurately when loaded at 1.693-inch OAL when launched at about 3,200 fps using about 13.5 grains of H110 (simulating the Hornady factory and Remington Premium factory loads). It is extremely effective on vermin up to prairie rat size. With top Hornet loads, it will deliver explosive performance to about 175 yards.
37-GRAIN CALHOON DOUBLE HP (MOLY PLATED): 45-GRAIN CASE OAL: 1.885 inches, which exceeds SAAMI maximum 22 Hornet length by 0.165-inch. For loads where length must conform to standard Hornet cartridge length, reduce charges about 0.8 grain. In the CZ test gun, these loads had 0.020-inch bullet-to-rifling jump. Seating these bullets to give between 5/1000- to 20/1000-inch bullet-to-rifling jump gives a shank-seating depth between about 0.085-inch and 0.100-inch. Such seating depth tinkering is feasible and desirable for improved accuracy but such loads can be rather fragile and deserve special care in storage, transportation, and handling.
PROPELLANT 300-MP
Lil’ Gun H110
A1680 2400
4227 (C)
TESTED CHARGE FPS @ 15’ STD. DEV. ACC. (IN) 15.6
37-GRAIN: CALHOON 3,400
14.5
*15.4 15.4 13.0 13.7
3,198 3,519 3,052 2,985 3,148
14 42 19 11 28 15
0.5 1.2 0.7 0.9 1.4
0.35
* 15.0 grains is likely maximum. Top loads can deliver explosive velocity to about 275 yards. Bullet seating is unusually easy.
www.varminthunter.org Page 173
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58 |
Page 59 |
Page 60 |
Page 61 |
Page 62 |
Page 63 |
Page 64 |
Page 65 |
Page 66 |
Page 67 |
Page 68 |
Page 69 |
Page 70 |
Page 71 |
Page 72 |
Page 73 |
Page 74 |
Page 75 |
Page 76 |
Page 77 |
Page 78 |
Page 79 |
Page 80 |
Page 81 |
Page 82 |
Page 83 |
Page 84 |
Page 85 |
Page 86 |
Page 87 |
Page 88 |
Page 89 |
Page 90 |
Page 91 |
Page 92 |
Page 93 |
Page 94 |
Page 95 |
Page 96 |
Page 97 |
Page 98 |
Page 99 |
Page 100 |
Page 101 |
Page 102 |
Page 103 |
Page 104 |
Page 105 |
Page 106 |
Page 107 |
Page 108 |
Page 109 |
Page 110 |
Page 111 |
Page 112 |
Page 113 |
Page 114 |
Page 115 |
Page 116 |
Page 117 |
Page 118 |
Page 119 |
Page 120 |
Page 121 |
Page 122 |
Page 123 |
Page 124 |
Page 125 |
Page 126 |
Page 127 |
Page 128 |
Page 129 |
Page 130 |
Page 131 |
Page 132 |
Page 133 |
Page 134 |
Page 135 |
Page 136 |
Page 137 |
Page 138 |
Page 139 |
Page 140 |
Page 141 |
Page 142 |
Page 143 |
Page 144 |
Page 145 |
Page 146 |
Page 147 |
Page 148 |
Page 149 |
Page 150 |
Page 151 |
Page 152 |
Page 153 |
Page 154 |
Page 155 |
Page 156 |
Page 157 |
Page 158 |
Page 159 |
Page 160 |
Page 161 |
Page 162 |
Page 163 |
Page 164 |
Page 165 |
Page 166 |
Page 167 |
Page 168 |
Page 169 |
Page 170 |
Page 171 |
Page 172 |
Page 173 |
Page 174 |
Page 175 |
Page 176 |
Page 177 |
Page 178 |
Page 179 |
Page 180 |
Page 181 |
Page 182 |
Page 183 |
Page 184 |
Page 185 |
Page 186 |
Page 187 |
Page 188 |
Page 189 |
Page 190 |
Page 191 |
Page 192 |
Page 193 |
Page 194 |
Page 195 |
Page 196 |
Page 197 |
Page 198 |
Page 199 |
Page 200 |
Page 201 |
Page 202 |
Page 203 |
Page 204 |
Page 205 |
Page 206 |
Page 207 |
Page 208 |
Page 209 |
Page 210 |
Page 211 |
Page 212