The Marksman was made from the mid 70' to sometime in the 80's. Answers has no way of displaying photographs but I did a web search on "Markaman 740 air gun" and found several images of the rifle. It should not be hard to find them.
It's a breal barrel rifle.
The marksman model 740 is rated at 425 fps.
THE MARKSMAN MODEL 740 air rifle was introduce in1970. It was discontinue in 1977.
Contact the maker for a replacement manual
It will use any .177 caliber pellet
I own a Marksman Model 740 .177 pellet rifle. It has a wood-patterned plastic stock. It is a single shot rifle that folds in the middle for cocking. The safety auto-enables after every trigger pull. You must cock and reset the safety. Hope that helps.
There is a Model 740 - plastic stock, cocks by breaking the barrel handle and pressing down. Takes standard BBs which are loaded in mass through an opening in the top-back of the receiver.
Open the hood and look after the fan belt ! Follow the belt and you will find it .
740
Probably - remove distributor cap and look
The Marksman Model 740 .177 pellet rifle. It has a wood-patterned plastic stock. It is a single shot rifle that folds in the middle for cocking and loading. The safety auto-enables after every trigger pull. You must cock and reset the safety
20% of 740 is 148. 20% OUT of 740 would be 592.
100% = 740 10% = 74 5% = 37 740 - 74 - 37 = 740 - 111 = 629