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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
22-250 for heavier bullets?
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<blockquote data-quote="brianwinzor" data-source="post: 35669" data-attributes="member: 1067"><p>Fifty Driver, My experience with both the 22/250 AI, and 220 Swift AI, found that the 220 Swift AI has a velocity advantage of 100 - 150 fps with bullets of 55 grains in weight. </p><p></p><p>However, that increases to well over 200 fps with bullets of 69 grains and above. I have found that this principle holds true with most larger cases in a particular calibre, that the biggest velocity gains are with the heaviest bullets. My records show that:</p><p></p><p>22/250 AI (28 deg) - capacity 48.0 grains</p><p>Rifle 1- Shilen SS 27 inch, 1 in 14 twist. </p><p>53 grain Sierra HP</p><p>40.5 grains IMR 4064 - 4,011 fps (max)</p><p>60 grain Hornady HP</p><p>46.0 grains Norma 205 - 3,782 fps (max)</p><p></p><p>22/250 AI (28 deg) - capacity 49.2 grains.</p><p>Rifle 2 Shilen 24.5 inch, 1 in 14 twist.</p><p>Sierra 69 HPBT</p><p>43.5 grains WIN WXR - 3,465 fps (Max)</p><p>44.0 grains Rel 22 - 3,442 fps (Max)</p><p>46.0 grains WIN WMR - 3,428 fps (Near Max)</p><p>55 and 60 grain bullet weights will be tested in near future.</p><p></p><p>220 Swift AI (40 degree)- Capacity 55.4 grns</p><p>Rifle 1- Shilen 25.25 inch, 1 in 12 twist</p><p>Sierra 53 grain HP</p><p>49.0 grains IMR 4831 - 4,146 fps (Max)</p><p>Sierra 55 grain SPBT</p><p>49.0 grains IMR 4831 - 4,128 fps (Max)</p><p>Nosler 60 grain SPBT </p><p>47.0 grains IMR 4831 - 3,906 fps (Max)</p><p>Sierra 69 grain HPBT (did not stabilise)</p><p>48.5 grains IMR 7828 - 3,653 fps (Max)</p><p>47.5 grains Norma MRP -3,782 fps (Max)*</p><p>* my gunsmith achieved this velocity prior to shipping to me. Unfortunately I could not source Norma MRP.</p><p>Regards, Brian.</p></blockquote><p></p>
[QUOTE="brianwinzor, post: 35669, member: 1067"] Fifty Driver, My experience with both the 22/250 AI, and 220 Swift AI, found that the 220 Swift AI has a velocity advantage of 100 - 150 fps with bullets of 55 grains in weight. However, that increases to well over 200 fps with bullets of 69 grains and above. I have found that this principle holds true with most larger cases in a particular calibre, that the biggest velocity gains are with the heaviest bullets. My records show that: 22/250 AI (28 deg) - capacity 48.0 grains Rifle 1- Shilen SS 27 inch, 1 in 14 twist. 53 grain Sierra HP 40.5 grains IMR 4064 - 4,011 fps (max) 60 grain Hornady HP 46.0 grains Norma 205 - 3,782 fps (max) 22/250 AI (28 deg) - capacity 49.2 grains. Rifle 2 Shilen 24.5 inch, 1 in 14 twist. Sierra 69 HPBT 43.5 grains WIN WXR - 3,465 fps (Max) 44.0 grains Rel 22 - 3,442 fps (Max) 46.0 grains WIN WMR - 3,428 fps (Near Max) 55 and 60 grain bullet weights will be tested in near future. 220 Swift AI (40 degree)- Capacity 55.4 grns Rifle 1- Shilen 25.25 inch, 1 in 12 twist Sierra 53 grain HP 49.0 grains IMR 4831 - 4,146 fps (Max) Sierra 55 grain SPBT 49.0 grains IMR 4831 - 4,128 fps (Max) Nosler 60 grain SPBT 47.0 grains IMR 4831 - 3,906 fps (Max) Sierra 69 grain HPBT (did not stabilise) 48.5 grains IMR 7828 - 3,653 fps (Max) 47.5 grains Norma MRP -3,782 fps (Max)* * my gunsmith achieved this velocity prior to shipping to me. Unfortunately I could not source Norma MRP. Regards, Brian. [/QUOTE]
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22-250 for heavier bullets?
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