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Question for FIFTY (Kirby Allen)????
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<blockquote data-quote="Fiftydriver" data-source="post: 108593" data-attributes="member: 10"><p>Wildcat,</p><p></p><p>I do not mean to rail on your parade but I have to totally honest with you. The 7mm AM will not perform as well with a 120 gr bullet weight as you would expect. In fact I would be suprised if it would offer much more velocity then a 7mm RUM would with this bullet weight. That said, the RUM is also far to large for good performance with a 120 gr bullet weight.</p><p></p><p>I have tested the 140 gr Accubond in a 26" barreled 7mm AM and topped 3700 fps which is where I stopped testing. I was only testing to get load data to offer customers as I have no intention of recommending any bullet weight under 160 gr for this very large 7mm wildcat.</p><p></p><p>The reason for my comments is because with the powders used in this design, you will be topping 110 gr of powder with a 120 gr pill. That much powder with the light bullet weight will simply not produce a quality extreme velocity spread and accuracy at long range will suffer.</p><p></p><p>The 140 gr pills are marginal in my opinion. They work but still, for long range shooting they are really to light to get the results you want and need.</p><p></p><p>At 160 gr you will start getting some very good consistant velocities and the case capacity can begin to be used to full advantage.</p><p></p><p>My second area of concern is that you want this rifle for a Long range "varmint" rifle. That is not the design purpose of this round. Not that it would not perform very well at this function but its really a waste of componants as barrel life will be extremely short in this role. </p><p></p><p>Designed for big game hunting, this chambering offers a very useful barrel life but for varmint hunting it would be very short lived.</p><p></p><p>TO be honest, if you wanted an AM for long range varminting and you wanted to use light weight bullets, the 270 AM loaded with a 130 gr Ballistic Tip in a 1-10 twist barrel would be a better choice.</p><p></p><p>Still hard on barrels and not extremely well suited to this bullet weight but it does perform well enough to be very useful and very accurate.</p><p></p><p>I have broken 3800 fps with the 130 gr ballistic tips in my 30" barreled rifles.</p><p></p><p>Just my opinion. No problem building you the rifle you want but want to give you my honest opinion of the question. That being, the 7mm AM is not a good choice for this type of project. </p><p></p><p>Remember at long range, +600 yards, velocity is not nearly as important as BC.</p><p></p><p>Good Shooting!!</p><p></p><p>Kirby Allen(50)</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 108593, member: 10"] Wildcat, I do not mean to rail on your parade but I have to totally honest with you. The 7mm AM will not perform as well with a 120 gr bullet weight as you would expect. In fact I would be suprised if it would offer much more velocity then a 7mm RUM would with this bullet weight. That said, the RUM is also far to large for good performance with a 120 gr bullet weight. I have tested the 140 gr Accubond in a 26" barreled 7mm AM and topped 3700 fps which is where I stopped testing. I was only testing to get load data to offer customers as I have no intention of recommending any bullet weight under 160 gr for this very large 7mm wildcat. The reason for my comments is because with the powders used in this design, you will be topping 110 gr of powder with a 120 gr pill. That much powder with the light bullet weight will simply not produce a quality extreme velocity spread and accuracy at long range will suffer. The 140 gr pills are marginal in my opinion. They work but still, for long range shooting they are really to light to get the results you want and need. At 160 gr you will start getting some very good consistant velocities and the case capacity can begin to be used to full advantage. My second area of concern is that you want this rifle for a Long range "varmint" rifle. That is not the design purpose of this round. Not that it would not perform very well at this function but its really a waste of componants as barrel life will be extremely short in this role. Designed for big game hunting, this chambering offers a very useful barrel life but for varmint hunting it would be very short lived. TO be honest, if you wanted an AM for long range varminting and you wanted to use light weight bullets, the 270 AM loaded with a 130 gr Ballistic Tip in a 1-10 twist barrel would be a better choice. Still hard on barrels and not extremely well suited to this bullet weight but it does perform well enough to be very useful and very accurate. I have broken 3800 fps with the 130 gr ballistic tips in my 30" barreled rifles. Just my opinion. No problem building you the rifle you want but want to give you my honest opinion of the question. That being, the 7mm AM is not a good choice for this type of project. Remember at long range, +600 yards, velocity is not nearly as important as BC. Good Shooting!! Kirby Allen(50) [/QUOTE]
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