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Long Range Hunting & Shooting
Bolt bounce and Scope shift when dry firing
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<blockquote data-quote="jdyoung" data-source="post: 1908427" data-attributes="member: 113391"><p><strong><em>Detecting Bolt Bounce, What I do:</em></strong></p><p><em><strong>Put a piece of masking tape on the stem of the bolt handle, and another piece along the edge of the cut in the stock for the bolt handle.</strong></em></p><p><em><strong></strong></em></p><p><strong><em>Cock the rifle making sure the bolt handle is as far down/closed as possible , ( no snap cap, or fired cartridge).</em></strong></p><p></p><p><em><strong>Then using a fine pencil/marker and straight edge, make a witness mark on the applied pieces of tape across the bolt handle and stock. Those aligning marks are one and two and show the bolt position at rest in Battery.</strong></em></p><p></p><p><strong><em>Dry fire the rifle.</em></strong></p><p></p><p><strong><em>Without touching the bolt handle, make a third mark on the stock to intersect with the first mark on the bolt handle. The third mark shows the position of the bolt handle after firing.</em></strong></p><p><strong><em></em></strong></p><p><strong><em>You can repeat the cocking and dry firing to see if the first and third marks continue to align after dry firing.</em></strong></p><p><strong><em></em></strong></p><p><strong><em>The difference between the second and third marks is how much the bolt moves to align the cocking piece in the cocking cam of the bolt during firing. Finding it's own center as such.</em></strong></p><p><strong><em></em></strong></p><p><strong><em>After exhibiting bolt bounce, even if there is a snap cap/ fired cartridge or loaded round in the chamber resulting in no bolt bounce observed, the cocking piece is still out of alignment with the bolt cocking cam. It is rubbing on the cocking cam surfaces where it shouldn't.</em></strong></p><p><strong><em></em></strong></p><p><strong><em>A final test is to cock the rifle, (no snap cap or fired cartridge), Important: when rotating the bolt handle down, align the first mark on the bolt handle with the third mark on the stock. With this alignment, when dry firing, the bolt bounce should be minimal indicating the prime resting spot that aligns the cocking piece with the cocking cam in the bolt. A slight adjustment upward will cause the bolt handle to deflect/bounce downward, conversely a slight adjustment downward will cause the bolt handle to deflect/bounce upward. </em></strong></p><p><strong><em></em></strong></p><p><strong><em><u>Remedy? ? ---consult a good smith to see if an attempt to have the bolt body rest slightly tig welded and then resurfaced to bring about proper bolt cocking cam/cocking piece alignment is possible. My preference is to have marks one and three aligned when finished.</u></em></strong></p></blockquote><p></p>
[QUOTE="jdyoung, post: 1908427, member: 113391"] [B][I]Detecting Bolt Bounce, What I do:[/I][/B] [I][B]Put a piece of masking tape on the stem of the bolt handle, and another piece along the edge of the cut in the stock for the bolt handle. [/B][/I] [B][I]Cock the rifle making sure the bolt handle is as far down/closed as possible , ( no snap cap, or fired cartridge).[/I][/B] [I][B]Then using a fine pencil/marker and straight edge, make a witness mark on the applied pieces of tape across the bolt handle and stock. Those aligning marks are one and two and show the bolt position at rest in Battery.[/B][/I] [B][I]Dry fire the rifle.[/I][/B] [I][B][/B][/I] [B][I]Without touching the bolt handle, make a third mark on the stock to intersect with the first mark on the bolt handle. The third mark shows the position of the bolt handle after firing. You can repeat the cocking and dry firing to see if the first and third marks continue to align after dry firing. The difference between the second and third marks is how much the bolt moves to align the cocking piece in the cocking cam of the bolt during firing. Finding it’s own center as such. After exhibiting bolt bounce, even if there is a snap cap/ fired cartridge or loaded round in the chamber resulting in no bolt bounce observed, the cocking piece is still out of alignment with the bolt cocking cam. It is rubbing on the cocking cam surfaces where it shouldn’t. A final test is to cock the rifle, (no snap cap or fired cartridge), Important: when rotating the bolt handle down, align the first mark on the bolt handle with the third mark on the stock. With this alignment, when dry firing, the bolt bounce should be minimal indicating the prime resting spot that aligns the cocking piece with the cocking cam in the bolt. A slight adjustment upward will cause the bolt handle to deflect/bounce downward, conversely a slight adjustment downward will cause the bolt handle to deflect/bounce upward. [U]Remedy? ? ---consult a good smith to see if an attempt to have the bolt body rest slightly tig welded and then resurfaced to bring about proper bolt cocking cam/cocking piece alignment is possible. My preference is to have marks one and three aligned when finished.[/U][/I][/B] [/QUOTE]
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Bolt bounce and Scope shift when dry firing
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